ASTM D4901-99

Standard Practice for Preparation of Solution of Liquid Vegetable Tannin Extracts

SCOPE
1.1 This method is intended for use in preparing a solution of liquid extract for use in the determination of the total solids, soluble solids, and non-tannins.
1.2 This standard may involve hazardous materials, operations, and equipment. This standard does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 09-May-1999
• ICS: 59.140.10 - Processes and auxiliary materials
• Technical Committee: D31 - Leather
• Drafting Committee: D31.01 - Vegetable Leather

Relations

• Replaced By: ASTM D4901-99(2004) - Standard Practice for Preparation of Solution of Liquid Vegetable Tannin Extracts
• Effective Date: 01-Apr-2004
• Referred By: ASTM D6409-99(2020) - Standard Practice for Color Tests with Sheepskin Skiver
• Effective Date: 10-May-1999
• Referred By: ASTM D4900-99(2020) - Standard Test Method for Lignosulfonates (Sulfite Cellulose) in Tanning Extracts
• Effective Date: 10-May-1999
• Referred By: ASTM D4904-99(2020) - Standard Practice for Cooling of Analytical Solutions
• Effective Date: 10-May-1999
• Referred By: ASTM D4899-99(2020) - Standard Practice for Analysis of Vegetable Tanning Materials—General
• Effective Date: 10-May-1999
• Referred By: ASTM D6402-99(2020) - Standard Test Method for Determining Soluble Solids and Insolubles in Extracts of Vegetable Tanning Materials
• Effective Date: 10-May-1999
• Referred By: ASTM D6406-99(2020) - Standard Test Method for Analysis of Sugar in Vegetable Tanning Materials
• Effective Date: 10-May-1999
• Referred By: ASTM D4903-99(2020) - Standard Test Method for Total Solids and Water in Vegetable Tanning Material Extracts
• Effective Date: 10-May-1999
• Referred By: ASTM D6407-99(2020) - Standard Test Method for Analysis of Iron and Copper in Vegetable Tanning Materials
• Effective Date: 10-May-1999
• Referred By: ASTM D6401-99(2020) - Standard Test Method for Determining Non-Tannins and Tannin in Extracts of Vegetable Tanning Materials
• Effective Date: 10-May-1999

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D 4901 – 99
Standard Practice for
Preparation of Solution of Liquid Vegetable Tannin Extracts
This standard is issued under the fixed designation D 4901; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 4.4 While the solubility is better in hot water than in cold
water, it is appropriate to dissolve and disperse an extract in hot
1.1 This practice covers the preparation of a solution of
water and then let the solution cool slowly to standard room
liquid extract that is to be used in the tannin analysis of that
temperature.
extract.
1.2 This standard does not purport to address all of the
5. Apparatus and Reagents
safety concerns, if any, associated with its use. It is the
5.1 Formaldehyde—40 % solution.
responsibility of the user of this standard to establish appro-
5.2 Toluene—assay $ 99.5 %.
priate safety and health practices and determine the applica-
5.3 Flask, 1 L volumetric. The Class A type, with upper bulb
bility of regulatory limitations prior to use.
in neck, is especially suitable for this work.
2. Referenced Documents
6. Test Specimen
2.1 ASTM Standards:
6.1 The specimen shall consist of an aliquot of the sample,
D 4904 Practice for Cooling of Analytical Solutions
prepared as described in Practice D 6404, sufficient to give a
D 6404 Practice for Sampling of Vegetable Materials Con-
solution containing as nearly as possible,4gof tannin per L
taining Tannin
(not less than 3.75 g, nor more than 4.25 g, per L).
2.2 ALCA Methods:
A10 Preparation of Solution of Liquid Extracts
7. Procedure
7.1 Prepare samples of liquid extracts, as described in
3. Summary of Practice
Practice D 6404, and allow to come to room temperature.
3.1 The practice describes a technique found useful in the
Thoroughly mix at room temperature and transfer specimen to
preparation of analytical strength solutions from samples of
a tared container and stoppered to prevent loss of moisture.
liquid vegetable tannin extracts.
Return no material which has been removed from the sample
4. Significance and Use for any other purpose (for example, for determination of
specific gravity, etc.) to the sample. Care must be taken that
4.1 The concentration of tannin in extracts must be reduced
dried material around the neck of the stopper of the sample
to analytical strength (4 g tannin per L) for analyses.
bottle does not contaminate the sample or specimen. Weigh the
4.2 Vegetable tannin extracts are heterogeneous mixtures of
container and specimen to the nearest 0.1 mg.
components with varying solubility.
4.3 The solubility of such extracts is influenced by tempera-
NOTE 1—Shaking by hand is rarely sufficient; mechanical shaking,
ture and concentration, which affect the degree of dispersion
especially with a clinical-type shaker for 10 min, is preferred. In the case
of very viscous extracts, a stirrer has to be used, in which case care must
and size of the component particles.
be taken to avoid the
...